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The electrons in the atoms of four eleme...

The electrons in the atoms of four elements A, B, C, and D are distributed in three shells having 1,3,5, and 7 electrons in their outermost shell respectively. State one period in which these elements can be placed in the Modern Periodic Table. Write the electronic configuration of the atoms A and D and molecular formula of the compound when A and D combine. 

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a] Since these elements have 3 shells, they are placed in the3rd period.
b] Electronic configuration: `A to 2, 8, 1` and `D to 2 , 8, 7`.
c] Both A and D have a valency of one and hence the compound formed by them has the formula AD.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
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  11. An element 'X' belongs to the 3rd period and group 16 of the Modern Pe...

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  15. From the part of the periodic table answer the following questions. ...

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  17. The position of three elements A, B and C in the periodic table is sho...

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  19. Observe the given table and question: answer the following {:("Elem...

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